Electric elevator.



C. B. MANULLB.

ELECTRIC ELEYATOR. APMICATION FILED Mmm, 1912 Patented Mal'. l0, 1914.

switches 2O and 2" make .the proper` armalure connection so that as soon as the motor circuit is closed, the motor will rotate in `a direction to lower the car, while the switches 5 24 close a circuitto the magnet of the main line switch and to the brake magnet. These latter circuits may be traced from the positive main lby Way of the conductor 46 to both. of the contacts common to the i0 switches 24.4 The circuit branches atthis point, part ofv it continuing by wire 47 through the governor switch 45, slack cable switch 44, through the winding 36 of the main line magnet M, through the contacts '34 and 35 of the safety switch S, and bythe wire 48, this circuit continues7 through the switch 11 in the car, the limit switches 12 and 13, and by the wire 49 to -the negative or m main. The main line switch now operates to close its contacts. The other branch of this circuit passes through the contacts ot the right hand switch 24, wire 50, contacts 42, through the brake magnet 10, and by .way of the contacts 40 and 41 to the negative or inaint The brake is now released and the motor circuit closed, this latter circuit being traced from the positive main -l-, through the contacts 39, wire 5l, contacts of the right hand switch 25, contacts 23` of switch 22, armature brush 52, through the motor armature to brush 53, wire 54, contacts 2l of switch 20, vwire 55, through the starting resistance 29, and by way ot the wire 56 and contacts 4l to the negative or main. rllhc motor now starts at slow speed to lower the car, the shunt field beingconneeted by the contacts 39 and 4l across the line. The switch connects the accelerating magnet A across the motor 40 armature and a small portion of the starting resistance so that it will operate gradually to short circuit the starting resistance and permit the motor to reach full normal speed. lt will be observed that 4tliesatety magnet docs not. operate at this time since its magnet winding 30 is short circuited by the door contacts 8, 7, G, 5 and the cargate contact 9. lhe upper terminal of this magnet is connected through the wire 57 and gate contact 9, through the door contacts 8, 7, G and 5, and by the wire 58 and contacts 32 and 33 and wire 59 to the lower terminal of the magnet, hence substantially no current will Apass through the mag-net and the same will not operate its contacts. Should, however, one ot the doors or the car gate be opened while the car is in motion, this shunt circuit around the magnet 30 is in terrupted and the magnet immediately be- 60 comes energized to raise its lCore and connected contacts 32 and 34, The circuit of this magnet being traced troni the positive main b the wire 46, through the switch 24, wire 4 governor switch 45, slack cable resaca? Vswitches 12 and 13andr by wire 49 to the negative or main.

The operation ot the safety switch S ini terruptsthe circuit to the magnet of the main linel switch M at the contacts' 34 and 35 and the switch M. drops its core, thereby opening the circuit to the motor and brake releasing magnet and the elevator immediately comes'to restl with the brake applied. lf the car gate or one of the landing doors be opcn and an attempt is made to operate the elevator, it is readily seen that-the safety switch is at once energized to open the circuit to the operating magnet ofthe main line switch so that the latter cannot possibly get current to close the motor and brake circuits under this condition. Furthermore, there can be no destructive arcing at the gate and door contacts at any time, since the circuit including these contacts is a mere shunt circuit around the magnet winding of the safety switch and when this shunt circuit is opened by opening a door,`the small current passing therethrough is merely diverted through the magnet ot' the safety switch and this current is of small amount being limited by the comparatively high resistance The operation of the system in a reverse direction is effected in the usual manner by giving an upward pull on' the hand rope H. The cam controlled switches operating as before, with the eil:-A

- in the ordinary practice, if a door or gate i be opened while the car is in motion the operating circuit is interrupted'and the elevator brought to rest. As soon, however,

as the door is closed the ear will imme-4 diately start again in the same directie-n ot' travel asbetorc. lith this arrangement the car operator soon learns that he can start and stop the car by merely opening or closing the car gate, or where the speed of the elevator is moderate and the car is not provided with a gat-e, he can reach out while the car is in motion and open a landing door which will stop the car. this method of controlling the starting and stopping of an elevator may involve less labor thaniis required to manipulate the controller, particularly when the controller is operated by means ot the well known hand rope, it is at best a very dangerous practice, and an elevator system which permits ot this talseoperation should not be countenanced, particularly in view of the While numerous and sometimes iatal accidents fromthis. cause alone, which arc of almost ilail y occurrence. illy invention entirely orereoinea this and other objectionable few tarea. Sinrti the operator in the ear niiit:l of netten-#ity tiret, liringthe controlling swit'irlito its center or t oil' l" position every tiiiie the ear its stopped, tiratore he eaii again start. the rar, aiiil in Starling,` the car it; in' absolutely iiifrefaiiri' to nianipiilate the proper tronti-ollliigjg nieana, ii'lietlier the saine lie a haiitl roiie or ear aiviti'li or ever or other ilei'iee. 15" tentare ot niy invention ia ot great practical iii'iportanee as regards the eonitort antl oal'ety ot" the oreupaiits ol' the eleiatoi', :intl 'lf attain the tlesiretl entl hy iiieaiia` (-oiniirisiiiel the sail'ety magnet switch ln eoniiertioii with thiS switch, it; will he oliaeri'eii that alioiiltl any one ol the lantliin;` iioorrs or the ear gate he opened and the ear stopped in ite' travel, the, Subsequent; elisinii o l" siieh tloor or Zf g'ate will not operate to tart the elevator. Thisl is bee-anse the operation ol the safety siiitrh open rireiiits the door aiitl inte contacts at the Switch eiintaetz 3Q, hence the closing ot' the door or gate tsoiitaeta eaii have ,no eli'eot; ii'hatxoever on ihe aiutino, afs the safety .Liivite'ri will reifiiei jizeil or in itz` oiiei'iitetl ptritioh inaiii jouit so long as ltS oiroiiit remains oloseil at the Controlling switch lil, the latter eat-al)- lis-ihinej a Dell holding eiieiiit tor the sa'lfety i-iii'itoh .ci over which the door and gate irontar'tia have no eoiitriilA The controlling switch ,lil iniist: be centered in order to interriipt this :iii-lt holding circuit 'l'or the aalfety biiitt'h, antl the controlling switch again loe inoi'etl to infiel-ating position hy the appropriate ineana tielore the ear :an again he oiieratetl. Bj, means of' my invention, the operator iiiiistV manipulate the controllingr nierliaiiiiai'i ei'ery time he (lenire-S to start ihr. eai aiitl 'l'or tliia reason the safety anil monitori: el. the paslleiig'ers iS not plaizeil in jeopai't'ly hy any art ot an iiieonipetent or rel operai orw 'onietiiiiebI the niaiii operating,d eiroiiit lieil tliioiiijli the tloor eontaets so that in trahi :i iloor lie, opened iifliilethe Car is in nioioii, the operating; elim-nitv iifill lie lirohon aiifl the motor iitopiietl. in Siitli rase the einirt i'iii'rt-iit olz the` operating;` eirtiiit is lii'olieii at, one oi the tlooi' rotiiaita aial the ariirofiiieeil ii'ill la i-,oiifiiiliiialile anil will iA iltirti'tiy lliil! iliii'ii' i'tililzitlt. iiirii't! Pill li: .nini-iiliiivo eoiitari` iiiiiiat ol: here` ilr fanali iliiiieni-iions :intl rat lier iltli- .ii-l iiirtlieriiit'ire are iiSiially iilai'eil in -iailile iilare ont ot sight. My inioii ei'ereoiniithe, tlaiiiaifingr ell'erlI nl raiii .narra iiiiil ai'i'iiii'i at the contara; in a novel :intl practieal manner. liiiie ai no time can there lie aniv aiiiii'eoiahlr :ami-kine; at ihr iloor con" or inirea'riea o't illiielratioii i have :ilioii'n and ileseriheil a haiiil rope operated eleetrie elevator, but it to he understood that niy invention is adapted to any and all eleelrio elevatori; in which door er gate contat-ta4 are iisetl to prevent operation of the elevator when a tloor or gate is opened.

lVhat I elaini is new and desire to secure by Letters Patent, ol the United States is:

il. In an eleetrie ele atoi.', the eonihinatioii ol a hoisting niotoi', an eleetro-responsiie tlei'iee for openingl antl cloeing the inotor eiroiiit, a normally closed safety switch in the circuit of the operating.;l .solenoid of .said eleetiro-respon iii'e device, a Solenoid for ei'- 'feeting the operation of said .v'zi'l'ety Iswitch, door eoiitaets i'irraiigeil at. the llooi landings, a eireiiit including,r .said door contains*y ar ranged in shunt; to said solenoid, antl i: resistance in series: with said solenoid and iiloor contacts.

2. ln an electric elevator, the eoinliination ol a hoiatiini; niot'or, a niain lino switch for 0 )eniiig antl closing;- a oireiiit tosaifl .ino` toi',` e eeti'o-iiiagnetiii iiieans for elleetiiiel the operation olf aan! inain lino switch, looioontaetfi arranged at the lloor lantliiigzgs, a normally eloaeil niagni'iiet, oontrolletl aal'ety switch in the ope ating eireiiit ol said iiiain line `switch, anti a eirt-iiit ineliiiling the door contacts arranged` in Ialiiint to the control-- ling niagiiet ol' ^iitl safety switch l'or short eireiiiting the 1aine iil'hen the landingr tloorm` are in closetl poi tion.

il. ln an electric elevator, the eoii'iliination oi an electrically controlled AA#Witt-li, a safety magnet; bivitoh in circuit, ii'itli the' op eratzing` magnetl of said s\i'iteli,a noriiially eloseil hiint aroiintl the magnety ol aaitl s-.il'ety sii'itirli, anil nieaiis associated with a lanilini floor t'or opening said -Shiint apen opening .-aii'l lantlini;l tloor.

l. lii :iii elet-trio elevator, the eoniliiiia* lion of a iiiain line Switch, iiieanl operated troni the rai' I'or ell'eitlng' the operation olf saitl :ni'itt-li, an eletti'iially oiieratetl :fal'ety siii'it'i'h eoiiiriilleil liy a liateli tloor for renileringg; saiil switch inoperative, :intl a liolilinj.; eireiiit for haaitl safely switeh es:- talilslii-tl liy the operation olf .said liaieh tlot-f, aitl eirriiit lining rontrolleil liy aaiil lii i iliiiiii-il iitiiiiis.

ln an elia'irie elevator, the i-oniiiiiiri`.ioiii,l':ii1ai',a niain line ziii'ileli. ine-i liriilleil Ytroni iin rar l'iir ii' ,etiiiig the ty iin-ii ol flaiil niaiii tine switch, ineai.:` int'i- ,oeiiileiit ol' saiil inaiii liiio .switfli :iet into operai' ioii hy lili'.l oprniiizf of an elevator tloor l'or rendu-ingl iaiil niain line sii'itf'ii inoperatii'tl iiiileifr: aiiil iiiitil saiil rontiollinjr nieanfl` lie liraty iiioveil to oil position.

('i. ln an eleetrie elevator. the tzoniliination ol iiieana eoinprisinzi;v a niaiii lint` sliviti'li roiitrolml Vtroni the ear liir starting and :stopping: the latter` iiiezin y intlepeiideiit ol,r .Haiti inaiii line .-\\'ili:h operated hy the optan liti ltlt) sell Y ing of a door for rendering Suid starting and name to this specification in the presence of stopping means mopei'ntwe and for preventtwo subscribing witnesses. mg the car from again being operated urb 4 T 1. less and until the door be Closed and the CHARLES B' MAB VlLLIL" 5 starting and stopping mechanism he moved \fVt.11esSes:

to off position. .W. H. BRADY,

In testimony whereof, I have signed my F. W. MIDGLEY. 

